Roof Strut and Bracing at Eaves, Valley & Apex

Roof Purlin behaviour is dependant upon a number of inter-relating factors such as that of Purlin stiffness, neutral axis to roof slope, the Purlin span, length of roof slope, Eaves/Apex conditions, Cladding Type and the fixing methods employed.

The following recommendations are based on best practice methodology. Determine requirements by:-

Cladding type - The table above is for Screw Fixed Cladding only. 

DIAGONAL PURLIN BRACE - DPB

NB. All SRS type struts have holes punched at both ends

for diagonal tie assemblies. NB: Where ‘single’ Diagonal Tie Assembly connects to a SRS, the end cleat of strut should be adjacent to Diagonal Tie Assembly. This will help to prevent detachment of the cleat from the strut under any excessive ‘peel load’ imparted by the Diagonal Tie Assembly.